warning MERCEDES-BENZ M-Class 2012 W166 Repair Manual

Problems
withthetransmission Problem Possible
causes/co nsequences andM Solutions
The
transm issionhas
problems shiftinggear. The
transm issionislosing oil.
X Have thetransm issioncheckedataqual ified specialist
workshop, e.g.anauthorized Mercedes-B enzCenter,
immediately. The
acceleration ability
is deteriorating.
The transm issionno
longer changes gear. The
transm issionisin emergency mode.
It is only possible toshift intosecon dgear andreverse gear.
X Stop thevehicle.
X Shift thetransm issiontoposition P.
X Switch offthe engine.
X Wait atleast 10seconds beforerestartingthe engine.
X Shift thetransm issiontoposition Dor R.
If D is selected, thetransm issionshiftsintosecon dgear; ifR is
selected, thetransm issionshiftsintoreverse gear.
X Have thetransm issioncheckedataqual ified specialist
workshop, e.g.anauthorized Mercedes-B enzCenter,
immediately. Refueling
Import
antsafety notes G
WARNING Gasoli
neand diesel fuelsarehighly flammable
and poisonous. Theyburnviolently andcan
cause serious injury.
Never allowsparks, flamesorsmoking
materials neargasoline ordiesel fuel!
Turn offthe engine beforerefueling.
Whenever youarearound gasoline ordiesel
fuel, avoid inhaling fumesandanyskin or
clothing contact.Extinguish allsmoking
materials.
Direct skincontactwith fuels andthe
inhalation offuel vapors aredamaging your
health. G
WARNING Overfilling
ofthe fuel tank maycreate
pressure inthe system whichcouldcause a
gas discharge. Thiscould cause thegasoline to
spray backoutwhen removing thefuel
pump nozzle,which couldcause personal
injury. G
WARNING Do
not filldiesel tankswith gasoline. Donot
mix diesel fuelwith gasoline. Otherwise the
fuel system andengine couldbedamaged. In
addition, thevehicle couldcatch fire.
! Donot use gasoline torefuel vehicles with
a diesel engine. Donot use diesel torefuel
vehicles withagasoline engine.Evena
small quantity ofthe wrong fuelwill
damage thefuel system andengine.
! Donot switch onthe ignition ifyou
accidentally refuelwiththewrong fuel.
Otherwise, thefuel willenter thefuel lines.
Notify aqual ified specialist workshop and
have thefuel tank andfuel lines drained
completely. Refueling
149Driving and parking Z

:
Toopen thefuel filler flap
; Toinsert thefuel filler cap
= Fuel type
? Tire pressure table
Opening X
Switc hoff the engine.
X Remove theSmart Keyfrom theignition
lock.
KEYLE SS-GO: open thedriver’s door.This
switches theignition toposition 0,which
correspon dstohaving removed the
Smart Key.Thedriver’s doorcanbeclosed
again.
X Press thefuel filler flapinthe direction of
arrow :.
The fuel filler flapswings up.
X Turn thefuel filler capcount er-clockwise
and remove it.
X Insert thefuel filler capinto theholder
bracket onthe inside offiller flap;.
X Completely insertthepump nozzleinto the
filler neck andrefuel.
X Only fillthe tank untilthepump nozzle
switches off.
! Overfilling thefuel tank could damage the
fuel system. Closing X
Replace thefuel filler capand turn it
clock wise. Thefuel filler capaudibl y
engages.
X Close thefuel filler flap. i
If
you drive withthefuel filler capopen,
reserve fuelwarning lamp8 flashes. In
addition, the; Check Engine warning
lamp maylight up.Am essage appears in
the multifunc tiondisplay (Ypage 257).
For furth erinfor mation onwarning and
indicat orlamps inthe instrument cluster,
see (Ypage 276). Refueling
151Driving and parking Z

When
the Remainin
gStarts: 16 message
is shown inthe multifunc tiondisplay, youcan
start theengine 16more times. IfDE Fis not
added, itwill notbepossible torestar tthe
engine. Fillthe DEF tank withapprox. 1gal
(3.8 l)DEF ,or have itfilled ataqual ified
specialist workshop. i
If
you drive thevehicle fasterthan10mph
(16 km/h), the Check
Additive See Operator's
Manual message
goesoff
after approximately oneminute.
Further information aboutBlueTEC exhaust
gas aftertr eatment andDEF isavaila bleatany
authorized Mercedes-Ben zCent er.
Adding DEF G
WARN
ING Make
sure
R DE Fdoes notcome intocontact with skin,
eyes, orcloth ing
R to keep DEFout ofthe reach ofchildren
If you and/or othershave come intocontact
with DEF:
R IfDE Fhas gotteninto contact with eyes,
flush withplenty ofwater immediately and
seek medical help.
R Clean affectedskin immediately withplenty
of water.
R IfDE Fw asswallowe d,rin se mout h
imm ediat elywith plentyof wate rand drink
pl enty ofwa ter. Consu ltaphy sicia n. G
WAR
NING If
yo uop en the DEF tank cap,sma llamo unts
of amm oniavap orma ybe released .This
depends inparticular upontheage ofthe DEF .
Ammon iavapors haveapungent odorandare
particularly irritatingto:
R skin
R mucous membranes
R eyes You
may experience aburning sensation in
your eyes, noseandthroat, aswell as
coughing andwatering ofthe eyes.
Do not inhale anyammonia vaporsthatmay
be released. Fillthe DEF tank onlyinwell-
ventilated areas.
! Only useDEF inaccordance with
ISO 22241 .Do not mix anyadditives with
DEF ,and donot dilute DEFwith water. This
may destroy theBlueTEC exhaustgas
aftertr eatment system.
! The vehicle mustbeparked onlevel
ground tofill the DEF tank.The DEF tank
can only befilled asinten dedwith the
vehicle parkedonalevel surface. This
avoids falselevelreadings. Fillingthetank
is not permitted ifthe vehicle isnot parked
on alevel surface. Thereisadanger of
overfilling, whichcouldresult indamage to
componen tsof the BlueTEC exhaustgas
aftertr eatment .
If the outside temperature islower than
Ò11 †,damage mayoccur whenadding DEF.
If DEF isfrozen andthere isan active warning
indicator, addingmaynotbepossible. Park
the vehicle inawarmer place,e.g.inagarage,
until DEFhasbecome fluidagain. Fillingis
then possible again.Alternatively, havethe
DEF tank refilled ataqual ified specialist
workshop.
! Rinse surfaces thathave come into
cont actwith DEFimmediately withwater or
remove DEFusing adamp clothandcold
water. Ifthe DEF hasalread ycrystallized,
use asponge andcold water toclean it.DEF
residues crystallize aftertimeand
cont aminate theaffected surfaces.
! DEF isnot afuel additive andmust notbe
added tothe fuel tank .If DEF isadded to
the fuel tank ,this canlead toengine
damage.
Further information onDEF (Ypage 387). Refueling
153Driving and parking Z

Closing
theDEF filler capand fuel filler
fla p X
Plac eDE Ffiller cap;onthe filler neckand
tur nit clo ckwi se.
X To closethe fuel fillerf lap, press itin the
direc tionofarrow :.
X Dr ive ataspeed above10mph (16km/h) .
The Chec
kAddi tive SeeOperator's Manu
al mess
agedisappears after
approx imatelyone minute. i
If
the Chec
kAddi tive See Oper
ator'sManu al mess
agecontinues
to be shown inthe mult ifunc tiondisplay,
you need toadd moreDE F. Par
king Imp
ortant safety notes G
WARN
ING Do
not park thisvehic lein areas where
com bustib lemat erials cancom eint ocon tact
with thehot exhaust system. Donot park the
vehic leon dry grass landorharve stedgrain
fields. Combust iblematerials, suchasgrass ,
hay orleaves couldbeignit edbythe hot
exh aust systemand cause avehic lefire . Unin
tended vehic lemov emen tcan cause
serio usperso nalinjury ordamage tothe
vehic leor the vehic ledrive train. Toreduc e
such risks,always dothe followin gbefor e
tur nin goff the engineand leavin gthe vehic le:
R keep yourright footonthe brak epedal.
R apply theelect ricpark ingbrak e.
R shift theautom atictransm ission intopark
posit ionP.
R slowly release thebrak epedal.
R when parkedon anincline, always turnthe
front wheels towards theroad curb.
R turn theSmartKey inthe ignition lockto
position 0and remove theSmartKey from
the ignition lock,orpress theKEYLES S-GO
Start /Stopbutton.
R take theSmartKey withyouand lock the
vehicle whenleaving. Switching
offthe engine
Import antsafety notes G
WARNING Never
switch offthe engine whilethevehicle
is in motion.
There isno brake boostforthe service brake
if the engine isnot running. Ifthe ignition is
switched off,there isalso nopower
assistance forthe steering.
You willrequire considerably moreeffort to
steer andbrake andyoucould therefore lose
cont rolofthe vehicle andcause anaccident. G
WARNING Keep
inmind thatturning offthe engine alone
only willshift theautomatic transmission into
neutral position Nautomatically .
Always shifttheautomatic transmission into
park position Pbefore turning offthe engine.
Otherwise thevehicle couldrollaway which
could result inan accident and/orserious
personal injury. Park
ing
155Driving and parking Z

road
,wea ther andtraffic conditions permit.In
some jurisdictions, itis forbid denfordrivers
to use mobil ephones whiledrivi ng.
Only opera teCOMAND (Cockpit Manag ement
and Data System) incompli ancewithalllega l
requ irements andwhen theroad ,wea ther and
traffic conditions permit.Youmay otherwi se
not beableto observe thetraffic conditions,
endange ringyourself andothers.
Reme mberthatyourvehicle coversa distanc e
of 44 feet (approximately 14m)asecon d
when itis travelin gat only 30mph
(approximately 50km/ h).
Drive sensibly –save fuel Obse
rvethe followi ngtips tosave fuel:
X The tires shouldalwa ysbe infla tedtothe
recomme ndedtirepres sure.
X Re move unneces saryloads.
X Re move roofcarrierswhe nthey arenot
needed.
X Warm upthe engine atlow engine speeds.
X Avoid frequent acceleration orbraking.
X Have allmaintenanc ework carried outas
indicated bythe service intervals inthe
Service Booklet orby the service interval
displa y.
Fuel consumption alsoincreases when
driving incold weather, instop-and- gotraffic
and inmountainous terrain.
Drinking anddriving G
WARNING Drink
ingand driving and/or takingdrugsand
driving arevery dangerous combinations.
Even asmall amount ofalcohol ordrugs can
affect yourreflexes, perceptions and
judgment.
The possibili tyof aserious oreven fatal
accident aregreatly increased whenyoudrink
or take drugs anddrive. Do
not drink ortake drugs anddrive orallow
anyone todrive whohasbeen drinking or
taking drugs.
Pedals G
WARNING Make
sureabsolu telynoobject sare
obstructin gthe pedals' rangeofmovement .
Keep thedriver's footwell clearofall
obstacles. Ifthere areany floormats or
carpets inthe footwell, makesurethatthe
pedals stillhave sufficient clearance.
During sudden drivingorbraking maneuvers,
the object scould getcaught between the
pedals. Youcould thennolonger brakeor
accelerate. Thiscould leadtoaccidents and
injury.
Rolling withtheengine switched off G
WARNING There
isno power assistance forthe steering
and thebrake whentheengine isnot running.
Steerin gand braking requires significantly
more effort andyoucould losecontrolofthe
vehicle andcause anaccident asaresult.
Do not turn offthe engine whilethevehicle is
in motion.
Exhaust check G
WARNING Inhalation
ofexhaust gasishazardous toyour
health. Allexhaust gascont ains carbon
monoxide (CO),andinhaling itcan cause
unconsc iousness andpossible death.
Do not run theengine inconfin edareas (such
as agarage) whicharenot properly ventilated.
If you think thatexhaust gasfumes are
enterin gthe vehicle whiledriving, havethe
cause determined andcorrect ed
immediately. Ifyou must driveunder these
condition s,drive onlywith atleast one
window fullyopen atall times. 158
Driving
tipsDriving and parking

Limi
tedbraking performa nce onsalt -
tr eat edroa ds G
WAR
NING The
layer ofsalt ontheb rake discs andthe
brake pads/linings maycauseadelay inthe
brakin geffec t,resultin gin asignific antly
longer brakingdistanc e,which couldleadto
an acciden t.
To avoid thisdanger, youshould:
R occ asionally brakecarefully, without
puttin gother roadusers atrisk, when you
are driving onsalted roads. Thishelps to
remov eany salt that may have startedto
build upon the brake discsandthebrake
pads/linin gs.
R maint ainagreater distancetothe vehicle
ahead anddrive withparticular care.
R carefully applythebrakes atthe end ofa
trip and immediately aftercommen cinga
new trip,sothat saltresidues areremoved
from thebrake discs.
Servicing thebrakes !
Ifthe red brake warning lamplights upin
the instr ument cluster andyouhear a
warning tonewhile theengine isrunnin g,
the brake fluidlevel maybetoo low.
Observe additional warningmessages in
the multifunct iondisplay .
The brake fluidlevel maybetoo low due to
brake padwear orleaking brakelines.
Have thebrake system checked
immediately. Thiswork should becarried
out atan authorized Mercedes-B enz
Center.
All check sand mainten ancework onthe
brake system mustbecarried outata
quali fiedspecialist workshop only.Have this
work carried outatan authorized Mercedes-
Benz Center.
Have thebrake padsreplaced andthebrake
fluid renewed ataquali fiedspecialist
workshop, e.g.anauthorized Mercedes-B enz
Center. G
WARNING If
brake padsorbrake fluidother thanthose
recommen dedareused, thebraking
properties ofthe vehicle canbedegraded to
an exten tthat safe braking issubstantially
impaired. Thiscould result inan accident.
! Afunct ionorperformance testshould
only becarried outona2 -axl e
dy nam ome ter.Ifyo uar eplanni ngtohave
the vehicleteste don such ady nam ome ter,
conta ctan author izedMer cedes-B enz
Ce nter toobtainfu rthe rinfo rma tionfir st.
Othe rwise, youcou ldda ma gethe drive
trai nor the brakesystem .
! Asthe ESP ®
sy stem opera tes
au toma tically, the engineand theigniti on
mu stbe switch edoff (Sma rtKeyin po sitio n
0 or 1in the igniti onlock orStar t/Stop
bu tton inpo sitio n0 or 1) wh ile the electri c
pa rking brakeisbe ing teste don abra ke
dy nam ome ter(ma ximu m10secon ds).
Brak ingtrigger edautomatic allybyESP®
may seriously damagethebrake system.
If your brake system issubject onlyto
moderate loads,youshould testthe
func tionality ofyour brakes atregular
int ervals bypressing firmlyonthe brake pedal
at high speeds. Thisimproves thegrip ofthe
brake pads. G
WARN
ING Make
surethatyoudonot endanger other
road users whenyouapply thebrakes.
You canfind adescript ionofBrak eAssist
(BAS )on (Ypage 61)orofBA SPLUS on
(Y page 62). 160
Driving
tipsDriving and parking

Winter
driving
Gene ralnote s G
WARNING If
the vehicl ebecome strappe din snow,
ensure thatsnow iskept away from the
exhau stpip eand from aroundthe vehicl eas
long asthe engine isrunning. Otherwise,
poi sonou scarbo nmonoxide (CO)mayenter
the vehicle, resulting inloss ofconsc iousness
and even death.
To assure sufficient freshairvent ilation, open
a window slightlyonthe side ofthe vehicle
not facing thewind.
At the onset ofwinter, haveyourvehicle
winterproof edataquali fiedspecialist
workshop, e.g.atan authorized Mercedes-
Benz Center. i
Vehicles
withadiesel engine: donot
cover theradiator, e.g.with aprotec tive
cover. Themeasuring functionofthe
Onboard Diagnosis Systemmayotherwise
provide inaccurate values.Someofthese
values arerequired bylaw and must
therefor ealwa ysbe accurate.
Driving withsumm ertires Observe
thenotesinthe "Winter operation"
section (Ypage 352).
Slippery roadsurfa ces G
WARNING The
outside temperature indicatorisnot
designed toserve asan ice-warnin gdevice
and istherefor eunsuitable forthat purpose.
Indicated temperatures justabove the
freezin gpoint donot guarantee thattheroad
surface isfree ofice. The road maystillbeicy,
especially inwooded areasoron bridges. G
WARNING On
slippery roadsurfaces, neverdownshift in
order toobtain braking action.Thiscould result
indrive wheel slipand reduced vehicle
cont rol.Your vehicle's ABSwillnotprevent
this type ofloss ofcont rol.
Drive particularly carefullyonslippery road
surfaces. Avoidsudden acceleration, steering
and braking maneuvers. Donot use thecruise
cont rolorDIS TRONIC PLUS.
If the vehicle threaten sto skid orcann otbe
stopped whenmoving atlow speed:
X Shift thetrans mission toposition N. i
For
more informat ionondriving with
snow chains, see(Ypage 353). G
WARNING Make
surethatyoudonot endanger other
road users whenyouapply thebrakes. Off-r
oaddriving
Import antsafety notes G
WARNING Grains
ofsand, particles ofdirt and other
abrasive materials canenter thebrake
system. Thiscanlead toexcessive wearand
unpredictable brakingefficienc y.
Aft erthe brakes havebeen exposed todirty
condit ions,havethem check edand cleaned
at aquali fiedspecialist workshop, e.g.an
authorized Mercedes-B enzCenter.
Otherwise, thereisarisk that braking power
may beinsufficient inthe event ofan
emergenc y,or that thebraking effectmaybe
unpredictable. G
WARNING Do
not load items onthe basic carrier bars.It
may cause instability duringsomemaneuvers
which couldresult inan accident .
Drive slowly inunkn ownterrain. Thiswill
make iteasier torecogn izeunexpect ed
obstacles andavoid damage tothe vehicle.
To help avoid thevehicle rollingover,never
turn itaround onsteep inclines. Ifthe vehicle 162
Driving
tipsDriving and parking

Check
listbefor edr iving off-road X
Engine oillevel: check theen gin eoil and
add oilifne ces sary.
When drivingonsteep grad ients,th eoil
leve lmust besuff iciently high toensure a
co rrect oilsupply inthev ehicle.
X DEF tank (BlueTEC vehicles): checkthe
fluid level and,ifnec essary, refilltothe
maximum (13l)(Y page 152).
X Wheel-changing toolkit:chec kthat the
jack isworkin gand make sureyouhave the
lug wrenc h,arobust towcable andafolding
spade inthe vehicle.
X Wheels andtires: chec kthe tire tread
depth andtirepressure.
X Check fordamage andremove anyforeign
objec ts,e.g. small stones,from the
wheels/tir es.
X Replace anymissing valvecaps.
X Replace dentedordamaged wheels.
X Rims: dentedorbent rimscanresult ina
loss oftire pressure anddamage thetire
bead. Therefor e,chec kyour rims before
driving off-road andreplace themas
required.
! Ifthe engine oilwarning lamplights up
while thevehicle isin motion ,stop the
vehicle inasafe place assoon aspossible.
Check theengine oillevel. Theengine oil
warning lampwarning mustnotbeignored.
Continuing thejourney whilethesymbol is
display edcould leadtoengine damage.
Checklist afterdriving off-road G
WARNIN
G If
you notic esudden significant vibrationsor
unusual handling performanc eor ifyou
suspect thatdamage hasoccurred tothe
vehicle, youshould activate thehazard
warning lamps,gentlyreduce speedand
carefully headforanarea thatislocated ata
safe distance fromtheroad.
Check thetires andtheunderside ofthe
vehicle fordamage. Ifthe vehicle seems unsafe,
havethevehicle towedawaytothe
nearest Mercedes-B enzCenter ortire dealer
to be repaired.
! Ifyou detect damage tothe vehicle after
driving off-road, havethevehicle checked
immediately ataquali fiedspecialist
workshop.
Drivin gover rough terrain placesgreater
demands onyour vehicle thandriving on
normal roads.Afterdriving off-road, check
the vehicle. Thisallows youtodetect damage
promptly andreduce therisk ofan accident
to yourself andother roadusers.
X Deact ivateDSR(Ypage 208).
X Vehicles withtheAIRMATIC package:
lower thevehicle toaride height suitable
for the road condit ions,e.g.tothe
highway /high-speed level.
X Clean theheadlamps andrear lights and
check fordamage.
X Clean thefront andrear license plates.
X Clean thewheels/tires withawater jetand
remove anyforeign objects.
X Clean thewheels, wheelarches andthe
vehicle underside withawater jet;check
for any foreign objectsand damage.
X Check whether twigsorother partsof
plants havebecome trapped. These
increase therisk offire and candamage
fuel pipes, brakehoses orthe rubber
bellows ofthe axle jointsand propeller
shafts.
X Aft erthe trip, examine withoutfailthe
entire undercarriage, wheels,tires,brakes,
bodywork structure,steerin g,chassis and
exhaust systemfordamage.
X Aft erdriving forexten dedperiods across
sand, mud,gravel, waterorinsimilarly dirty
condit ions,havethebrake discs, wheels,
brake pads/linings andaxle jointscheck ed
and cleaned.
X Ifyou detect strongvibrations afteroff-road
travel, checkforforeign objectsin the
wheels anddrive trainandremove themif 164
Driving
tipsDriving and parking

Trave
ling uphi ll
App roac h/depa rture angle :
: 14
;
Ste
el-spri ng
ve hic les 26° 25° 25°
Veh
icle swi th
the AIRMA TIC
pac kag e Hig
hway level 23° 22°
22°
15 Ra
ised level 28° 27° 27°
R
Co mpl ywi th the rulesfor off-roaddri ving .
R Do not drive atan ang leon slop es,incl ines
or gra dients, butinstea dfol low the direct
li ne offall.T he maximum gradient-climbing
capabil ityofyour vehicle is100%, which
corresponds toan approach/departure
angle of45°. Note thatthevehicle's
gradient-c limbingcapabilitydepends on
the off-r oad condition s.
R Before tackling steepdownhill gradients,
select shiftrange 1.
R Drive slowly .
R Avoid highengine speeds –drive ata
sui table engine speed(maxi mum 3000
rpm). R
When drivingdow nanincli ne, makeuseof
the engine'sbra king effect. Observethe
eng inespeed;do not overrevthe engine.
R Check thebrakes afterdriving off-road for
a long time. G
WARNING Never
turnthevehicle around onsteep
inclines. Thevehicle mightrollover. Ifthe
vehicle cannotcomplete theattempt edclimb,
back itdown inreverse gear. i
Hill
start assist willaidyou when pulling
away onahill.
For further information ,see "Hill start
assist" (Ypage 142).
Maximum gradient-climbing capability For
good roadsurface condition s,the
maximum gradient-climbingcapabilityis
100%, whichcorresponds toan approach/
departure angleof45°. Note thatthe
vehicle's gradient-c limbingcapability
depends onthe off-r oad condition s.
Acc elerate carefully andmake surethatthe
wheels donot spin when driving onsteep
terrain. i
If
the load onthe front axleisreduced
when pullingaway onasteep uphillslope,
the front wheels haveatenden cytospin.
4ETS recogniz esthis and brakes the
wheels accordingly. Therear wheel torque
is increased, makingiteasier todrive off.
Brow ofhill When
driving upanuphill gradient, slightly
reduce pressure onthe accelerator
immediately beforereaching thebrow ofthe
hill. Use thevehicle's ownimpetus todrive
over thetop ofthe hill.
14 With AMG bodystyling.
15 166
Driving
tipsDriving and parking

The ML 350 4MATIC model has a departure angle of 23°.

This
style ofdriving prevent s:
R the vehicle fromlifting offthe ground onthe
brow ofahill
R the vehicle fromtraveling tooquickly down
the other side
Driving downhill R
Drive slowly.
R Do not drive atan angle down steep
inclines. Steer into theline offall and drive
with thefron twheels aligned straight.
Otherwise, thevehicle couldslipsidewa ys,
tip and rollover.
R Before tackling steepdownhill gradients,
select shiftrange 1.
R Act ivate DSR. Ifthis isnot sufficient, brake
gently. Whendoingso,make surethatthe
vehicle isfacing inthe direction ofthe line
of fall.
R Check thatthebrakes areworking normally
after along downhill stretch. i
The
special off-road ABS settin genables
a precise, briefandrepeated lockingofthe
front wheels, causing themtodig into the
loose earth. Beaware thatthefront wheels
easily skidacross theground surface if
completely brakedandtherefore losetheir
abili tyto steer. Driving
systems Cruise
control
Import antsafety notes G
WARNING The
cruise controlisaconven iencesystem
designed toassist thedriver during vehicle
operation. Thedriver isand must always
remain responsible forthe vehicle's speed
and forsafe brake operation.
Only usethecruise controlifthe road, traffic,
and weather condition smake itadvisabl eto
travel ataconst antspeed. R
The useofthe cruise controlcan be
dangerous onwinding roadsorinheavy
traffic because condition sdo not allow safe
driving ataconst antspeed.
R The useofthe cruise controlcan be
dangerous onslippery roads.Rapid
changes intire tract ioncan result inwheel
spin andloss ofcont rol.
R Deactivate thecruise controlwhen driving
in fog.
The "Resu me"funct ionshould onlybe
operated ifthe driver isfully aware ofthe
previously setspeed andwishes toresume
this particular presetspeed. G
WARNING The
cruise controlbrakes automatically so
that thesetspeed isnot exceeded.
General notes Cruise
controlmaintains aconst antroad
speed foryou. Itbrakes automatically inorder
to avoid exceeding thesetspeed. Onlong and
steep downhill gradients, especiallyif the
vehicle isladen ortowing atrailer, youmust
select shiftrange 1,2or 3in good time. By
doing so,you willmake useofthe braking
effect ofthe engine, whichrelieves theload
on the brake system andprevents thebrakes
from overheating andwearing tooquickly.
Use cruise controlonly ifroad andtraffic
condition smake itappropriate tomaintain a
steady speedforaprolonged period.Youcan
set any road speed above20mph
(30 km/h). i
Cruise
controlshould notbeactivated
during off-road driving. Driving
systems
167Driving and parking Z